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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3787) Increment is non-idempotent but client retries RPC
Date Wed, 30 Jan 2013 21:21:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566915#comment-13566915
] 

Enis Soztutar commented on HBASE-3787:
--------------------------------------

This is a bit orthogonal, but we need a nounce-like mechanism for client -> master RPC's
as well. Currently most of the master operations are semi-async, meaning that they initiate
a task (disable table), but have no way of asking the master later, about the status of the
request. This is different than using RPC callId, because the RPC call itself finishes, but
not the side effect of the operation. 
                
> Increment is non-idempotent but client retries RPC
> --------------------------------------------------
>
>                 Key: HBASE-3787
>                 URL: https://issues.apache.org/jira/browse/HBASE-3787
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.96.0, 0.94.4
>            Reporter: dhruba borthakur
>            Priority: Critical
>             Fix For: 0.96.0
>
>
> The HTable.increment() operation is non-idempotent. The client retries the increment
RPC a few times (as specified by configuration) before throwing an error to the application.
This makes it possible that the same increment call be applied twice at the server.
> For increment operations, is it better to use HConnectionManager.getRegionServerWithoutRetries()?
Another  option would be to enhance the IPC module to make the RPC server correctly identify
if the RPC is a retry attempt and handle accordingly.

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